30866221 has 4 divisors (see below), whose sum is σ = 30919392. Its totient is φ = 30813052.

The previous prime is 30866219. The next prime is 30866257. The reversal of 30866221 is 12266803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12266803 = 127 ⋅96589.

It is a cyclic number.

It is not a de Polignac number, because 30866221 - 2¹ = 30866219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30866221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30866261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25705 + ... + 26878.

It is an arithmetic number, because the mean of its divisors is an integer number (7729848).

Almost surely, 2^30866221 is an apocalyptic number.

It is an amenable number.

30866221 is a deficient number, since it is larger than the sum of its proper divisors (53171).

30866221 is an equidigital number, since it uses as much as digits as its factorization.

30866221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53170.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 30866221 is about 5555.7376647930. The cubic root of 30866221 is about 313.6855311104.

The spelling of 30866221 in words is "thirty million, eight hundred sixty-six thousand, two hundred twenty-one".